JPH0214926A - Front wheel transmission gear for tractor - Google Patents

Abstract

PURPOSE:To smooth a turn so sharply as well as to make such turning transmission as conformed to the running ground performable by rotating both symmetrical front wheels at the turning side at double speed through a double speed transmission gear with a differential gear when detecting any slip in these front wheels at the turning side. CONSTITUTION:A clutch 19 is installed between clutch shafts 17, 18 rotating gears 16 in mesh of gears 15 of symmetrical axles 5, 6. This clutch 19 is interlocked on or off by a slip sensor 4 detecting any slip in both front wheels 1, 2. When a slip of more than the specified one has occurred in rotation of the front wheel 1 or 2, the clutch 19 is turned on and thereby these symmetrical shafts 17, 18 are rotated as one body. With this rotation, when the axle 5 or 6 on one side is rotated at double speed, the axles 6 or 5 on the other are also rotated at the same double speed by way of the clutch 19 or the like.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a front wheel transmission device for a tractor.

PRIOR ART AND PROBLEMS TO BE SOLVED BY THE INVENTION In tractor work, during the straight traveling work stroke, a so-called differential lock is used to prevent the differential gear of the traveling transmission from shifting, and during the turning stroke at the end of the work stroke, the differential lock is used. The differential gear is operated to carry out S-turning steering, and at this time, the front wheels are rotated at an increased speed in order to facilitate this turning steering.

However, it is complicated to perform such accelerated rotation of the front wheels during driving operation.

Means for Solving the Problems This invention provides an axle (
5) (6) is increased to approximately twice the rotational speed via the differential device (3) by a slip sensor (4) that detects the slip of the front wheel (1) or (2) on the steering side. Double speed transmission! A front wheel transmission device for a tractor is provided with a tIJ device.

Function and effect of the invention In turning steering, the front wheels (1) or (2) on the turning side
) has a double speed transmission with a differential (3), so that the rotational speed of the rear wheels is twice as high as C.

The front wheel (2) or (1) on the opposite side becomes free to rotate, and the speed of the front wheel (1) or (2) becomes greater than the speed of the rear wheel, so turning is performed smoothly. -0 At this time, if the front wheels (1) or (2) on the turning side slip, the slip sensor (4) detects this and the double speed transmission device causes the left and right front wheels (1) to slip. )
(2) are both rotated at twice the rotational speed.

In this way, when the slip sensor (4) that detects the slip of the front wheel (1) or (2) on the turning side detects slip during turning, the double speed with this differential value δ(3) is The left and right front wheels (1) on the turning side are controlled by the transmission device.
(2) both rotate at double speed, it is possible to turn smoothly, and when no slip occurs, only the front wheel (1) or (2) on the turning side is transmitted at double speed. In order to turn, the front wheel (1) or (2) only on the turning side is controlled by a double speed transmission using a differential value of 51 (3).
) and the double-speed rotation transmission of both left and right front wheels (1) and (2) are automatically performed by slip detection by the slip select (4), and the turning transmission is adjusted according to the driving surface. can be made to do so.

Example: On the park side, the tractor has front wheels (1) (2)
, and the rear wheels are configured to transmit power via a differential device,
Further, the rear wheels are configured so that a brake can be applied to power transmission to the rear wheels on the turning side during turning steering. Front wheel (
1) (2) are provided at the ends of the left and right axles (5) and (6),
Regarding the 0x speed transmission device that can be freely steered by the steering wheel, these axles (5) and (6) are equipped with a mission? from the input shaft (7) that receives power from the gear to the gear (8), the differential (3), and the left and right front wheel axles (9) (10).
, clutches (11), (12), etc., and the left and right front wheel axles (9) (1G) are differentially transmitted by a differential device (3). Therefore, the clutch (1
1) By entering (12), the left and right front wheels (1) (
2) is differentially transmitted. Also, each left and right clutch (11)
(12) This clutch (11) (12)
Brakes (13) (14) are provided for braking on the front wheel axle (9) (10) side at the cut position, and by moving these brakes (13) or (14), the stiffness brake (13) or The rotation of the front wheel axle (9) or (lO) on the braked side of (+4) is stopped, and the front wheel axle (10) or (9
) rotates at - twice the speed.

From the gear (15) of the left and right axles (5) (6) to the gear (1B
) A clutch (19) is provided between the clutch shaft (17) (1g) that engages and rotates, and this clutch (19) is turned on and off by a slip sensor (4) that detects the slip of the front wheels (1) and (2). Interlock.

When a slip of more than a certain level occurs in the rotation of the front wheels (1) or (2), the clutch (18) is engaged and the left and right shafts (17) are activated by the detection by the slip sensor (4).
(1B) is rotated as one unit. As a result, when the axle (5) or (6) on one side is rotated at double speed, the other axle (6) or (5) is also rotated by the clutch (19)? It is then rotated at the same double speed.

When driving in four-wheel drive, clutch (11) (12
) is engaged and the clutch (19) is disengaged to transmit running power. The front wheels (1) and (2) are powered via a differential (3). Rotation is transmitted to the rear wheels at the same speed as the front wheels.

When turning to the right, the left clutch (11)
is disengaged, the brake (13) is applied, and the right clutch (12) is engaged.

When the clutch (19) is disengaged, power is transmitted to the right front wheel (2) at 12 times the speed of the rear wheel, and the left front wheel (1) becomes idling.

Also, when turning to the left, the action is reversed to that described above.

If the front wheel (1) or (2) on the turning side slips during these turns, the driving force by these front wheels (1) and (2) will be reduced. When this slip occurs, the slip sensor (4) detects it and the clutch (13)
) is turned on and the front wheel (1) is slipping on the turning side.
) or (2), the front wheel (2) or (1), which was spinning on the opposite side, can also be rotated at twice the speed to escape from the slip position.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention, and FIG. 1 is a diagram of the main part of the transmission mechanism. In the figure, symbols (1) and (2) are front wheels, (3) is a differential gear,
(4) is slip sensor, (11) (12) is clutch, (+3) (14) is brake, (19)
indicates a clutch.

Claims (1)

[Claims] The axles (5) and (6) of a pair of left and right front wheels (1) and (2) which are differentially transmitted by a differential device (3) and are steerable,
The differential gear (3) is controlled by a slip sensor (4) that detects the slip of the steering side front wheel (1) or (2)
A front wheel transmission device for a tractor, which is equipped with a double speed transmission device that transmits the rotational speed almost twice as much through the front wheel transmission device.